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### Selected Images
![Axial T2 MR demonstrates normal variant anatomy with mild asymmetric prominence of the right lateral ventricle <img src='/img/arrows/CO.png'/> when compared to the left. Note the septum is slightly deviated to the left <img src='/img/arrows/CS.png'/>.](images/app.statdx.com_image_thumbnail_74e87ea4-3c2a-400b-b714-f9fa2db4e66a_annotated_true_size_900_quality_90_2466c18c_20251018T165124Z.jpg)
![Axial T2 MR demonstrates normal variant anatomy with mild asymmetric prominence of the right lateral ventricle <img src='img/arrows/CO.png'/> when compared to the left. Note the septum is slightly deviated to the left <img src='img/arrows/CS.png'/>.](images/app.statdx.com_image_thumbnail_74e87ea4-3c2a-400b-b714-f9fa2db4e66a_annotated_true_size_900_quality_90_2466c18c_20251018T165124Z.jpg)
**Normal Variant**
*Axial T2 MR demonstrates normal variant anatomy with mild asymmetric prominence of the right lateral ventricle <img src='/img/arrows/CO.png'/> when compared to the left. Note the septum is slightly deviated to the left <img src='/img/arrows/CS.png'/>.*
*Axial T2 MR demonstrates normal variant anatomy with mild asymmetric prominence of the right lateral ventricle <img src='img/arrows/CO.png'/> when compared to the left. Note the septum is slightly deviated to the left <img src='img/arrows/CS.png'/>.*
![Axial T2 MR demonstrates normal variant anatomy with mild asymmetric prominence of the right lateral ventricle <img src='/img/arrows/CO.png'/> when compared to the left. Note the septum is slightly deviated to the left <img src='/img/arrows/CS.png'/>.](images/app.statdx.com_image_thumbnail_74e87ea4-3c2a-400b-b714-f9fa2db4e66a_size_174_quality_85_592b5076_20251018T165117Z.jpg)
![Axial T2 MR demonstrates normal variant anatomy with mild asymmetric prominence of the right lateral ventricle <img src='img/arrows/CO.png'/> when compared to the left. Note the septum is slightly deviated to the left <img src='img/arrows/CS.png'/>.](images/app.statdx.com_image_thumbnail_74e87ea4-3c2a-400b-b714-f9fa2db4e66a_size_174_quality_85_592b5076_20251018T165117Z.jpg)
**Normal Variant**
*Axial T2 MR demonstrates normal variant anatomy with mild asymmetric prominence of the right lateral ventricle <img src='/img/arrows/CO.png'/> when compared to the left. Note the septum is slightly deviated to the left <img src='/img/arrows/CS.png'/>.*
*Axial T2 MR demonstrates normal variant anatomy with mild asymmetric prominence of the right lateral ventricle <img src='img/arrows/CO.png'/> when compared to the left. Note the septum is slightly deviated to the left <img src='img/arrows/CS.png'/>.*
![Axial FLAIR MR demonstrates a large, heterogeneous mass in the left frontal lobe <img src='/img/arrows/CS.png'/> with surrounding edema and mass effect with compression of the left lateral ventricle <img src='/img/arrows/CO.png'/> and moderate dilation of the right lateral ventricle <img src='/img/arrows/CC.png'/>.](images/app.statdx.com_image_thumbnail_ddc74acb-a5fe-4147-bc17-3e3862305da7_annotated_true_size_900_quality_90_d599964a_20251018T165124Z.jpg)
![Axial FLAIR MR demonstrates a large, heterogeneous mass in the left frontal lobe <img src='img/arrows/CS.png'/> with surrounding edema and mass effect with compression of the left lateral ventricle <img src='img/arrows/CO.png'/> and moderate dilation of the right lateral ventricle <img src='img/arrows/CC.png'/>.](images/app.statdx.com_image_thumbnail_ddc74acb-a5fe-4147-bc17-3e3862305da7_annotated_true_size_900_quality_90_d599964a_20251018T165124Z.jpg)
**Extrinsic Mass Effect**
*Axial FLAIR MR demonstrates a large, heterogeneous mass in the left frontal lobe <img src='/img/arrows/CS.png'/> with surrounding edema and mass effect with compression of the left lateral ventricle <img src='/img/arrows/CO.png'/> and moderate dilation of the right lateral ventricle <img src='/img/arrows/CC.png'/>.*
*Axial FLAIR MR demonstrates a large, heterogeneous mass in the left frontal lobe <img src='img/arrows/CS.png'/> with surrounding edema and mass effect with compression of the left lateral ventricle <img src='img/arrows/CO.png'/> and moderate dilation of the right lateral ventricle <img src='img/arrows/CC.png'/>.*
![Axial T2 MR demonstrates a large, cystic encephalomalacia in the left frontal and parietal lobes due to chronic infarction <img src='/img/arrows/CC.png'/> with ex-vacuo dilation of the left lateral ventricle <img src='/img/arrows/CS.png'/>.](images/app.statdx.com_image_thumbnail_f987a5f2-594d-4b3a-84d0-640a0b70c03b_annotated_true_size_900_quality_90_e62de461_20251018T165124Z.jpg)
![Axial T2 MR demonstrates a large, cystic encephalomalacia in the left frontal and parietal lobes due to chronic infarction <img src='img/arrows/CC.png'/> with ex-vacuo dilation of the left lateral ventricle <img src='img/arrows/CS.png'/>.](images/app.statdx.com_image_thumbnail_f987a5f2-594d-4b3a-84d0-640a0b70c03b_annotated_true_size_900_quality_90_e62de461_20251018T165124Z.jpg)
**Encephalomalacia, General**
*Axial T2 MR demonstrates a large, cystic encephalomalacia in the left frontal and parietal lobes due to chronic infarction <img src='/img/arrows/CC.png'/> with ex-vacuo dilation of the left lateral ventricle <img src='/img/arrows/CS.png'/>.*
*Axial T2 MR demonstrates a large, cystic encephalomalacia in the left frontal and parietal lobes due to chronic infarction <img src='img/arrows/CC.png'/> with ex-vacuo dilation of the left lateral ventricle <img src='img/arrows/CS.png'/>.*
![Axial T2 MR demonstrates a large amount of acute intraventricular hemorrhage with mild dilation of the right lateral ventricle <img src='/img/arrows/CS.png'/>. Note CSF seepage in the peritrigonal region <img src='/img/arrows/CC.png'/>.](1ce39627-5994-4f0b-a77e-c02fcf1d1c66)
![Axial T2 MR demonstrates a large amount of acute intraventricular hemorrhage with mild dilation of the right lateral ventricle <img src='img/arrows/CS.png'/>. Note CSF seepage in the peritrigonal region <img src='img/arrows/CC.png'/>.](1ce39627-5994-4f0b-a77e-c02fcf1d1c66)
**Intraventricular Hemorrhage**
*Axial T2 MR demonstrates a large amount of acute intraventricular hemorrhage with mild dilation of the right lateral ventricle <img src='/img/arrows/CS.png'/>. Note CSF seepage in the peritrigonal region <img src='/img/arrows/CC.png'/>.*
*Axial T2 MR demonstrates a large amount of acute intraventricular hemorrhage with mild dilation of the right lateral ventricle <img src='img/arrows/CS.png'/>. Note CSF seepage in the peritrigonal region <img src='img/arrows/CC.png'/>.*
![Axial NECT demonstrates a large left subdural hematoma <img src='/img/arrows/BS.png'/> and a small parenchymal hemorrhage <img src='/img/arrows/BO.png'/>, resulting in rightward subfalcine herniation <img src='/img/arrows/CS.png'/>, compression of the left lateral ventricle <img src='/img/arrows/CO.png'/>, and mild dilation of the right lateral ventricle <img src='/img/arrows/CC.png'/>.](b9992ffd-4f31-44e2-8c92-83ab8fad30c1)
![Axial NECT demonstrates a large left subdural hematoma <img src='img/arrows/BS.png'/> and a small parenchymal hemorrhage <img src='img/arrows/BO.png'/>, resulting in rightward subfalcine herniation <img src='img/arrows/CS.png'/>, compression of the left lateral ventricle <img src='img/arrows/CO.png'/>, and mild dilation of the right lateral ventricle <img src='img/arrows/CC.png'/>.](b9992ffd-4f31-44e2-8c92-83ab8fad30c1)
**Herniation Syndromes, Intracranial**
*Axial NECT demonstrates a large left subdural hematoma <img src='/img/arrows/BS.png'/> and a small parenchymal hemorrhage <img src='/img/arrows/BO.png'/>, resulting in rightward subfalcine herniation <img src='/img/arrows/CS.png'/>, compression of the left lateral ventricle <img src='/img/arrows/CO.png'/>, and mild dilation of the right lateral ventricle <img src='/img/arrows/CC.png'/>.*
*Axial NECT demonstrates a large left subdural hematoma <img src='img/arrows/BS.png'/> and a small parenchymal hemorrhage <img src='img/arrows/BO.png'/>, resulting in rightward subfalcine herniation <img src='img/arrows/CS.png'/>, compression of the left lateral ventricle <img src='img/arrows/CO.png'/>, and mild dilation of the right lateral ventricle <img src='img/arrows/CC.png'/>.*
![Axial FLAIR MR demonstrates a large surgical defect in the left frontal lobe <img src='/img/arrows/CO.png'/> due to a tumor resection with resultant mild prominence of the left lateral ventricle <img src='/img/arrows/CS.png'/>.](a77eef3e-29e3-44c5-88bc-d67eff223e44)
![Axial FLAIR MR demonstrates a large surgical defect in the left frontal lobe <img src='img/arrows/CO.png'/> due to a tumor resection with resultant mild prominence of the left lateral ventricle <img src='img/arrows/CS.png'/>.](a77eef3e-29e3-44c5-88bc-d67eff223e44)
**Surgical Defects**
*Axial FLAIR MR demonstrates a large surgical defect in the left frontal lobe <img src='/img/arrows/CO.png'/> due to a tumor resection with resultant mild prominence of the left lateral ventricle <img src='/img/arrows/CS.png'/>.*
*Axial FLAIR MR demonstrates a large surgical defect in the left frontal lobe <img src='img/arrows/CO.png'/> due to a tumor resection with resultant mild prominence of the left lateral ventricle <img src='img/arrows/CS.png'/>.*
![Axial T1 C+ MR demonstrates enhancing intraventricular mass <img src='/img/arrows/CS.png'/> with obstructive dilation of the left temporal horn <img src='/img/arrows/CO.png'/>.](181895c1-e6ec-4317-a0d8-d85acb1e681a)
![Axial T1 C+ MR demonstrates enhancing intraventricular mass <img src='img/arrows/CS.png'/> with obstructive dilation of the left temporal horn <img src='img/arrows/CO.png'/>.](181895c1-e6ec-4317-a0d8-d85acb1e681a)
**Obstructive Hydrocephalus**
*Axial T1 C+ MR demonstrates enhancing intraventricular mass <img src='/img/arrows/CS.png'/> with obstructive dilation of the left temporal horn <img src='/img/arrows/CO.png'/>.*
*Axial T1 C+ MR demonstrates enhancing intraventricular mass <img src='img/arrows/CS.png'/> with obstructive dilation of the left temporal horn <img src='img/arrows/CO.png'/>.*
![Axial T2 MR demonstrates a shunt catheter in the right lateral ventricle <img src='/img/arrows/CS.png'/> with asymmetric lateral ventricles due to overdrainage of the right <img src='/img/arrows/CO.png'/> and mild underdrainage of the left <img src='/img/arrows/CC.png'/>. Note susceptibility artifact <img src='/img/arrows/WS.png'/> due to the shunt reservoir.](6a5a42a2-43a2-4fe6-8dd5-b2b1fc3e83fd)
![Axial T2 MR demonstrates a shunt catheter in the right lateral ventricle <img src='img/arrows/CS.png'/> with asymmetric lateral ventricles due to overdrainage of the right <img src='img/arrows/CO.png'/> and mild underdrainage of the left <img src='img/arrows/CC.png'/>. Note susceptibility artifact <img src='img/arrows/WS.png'/> due to the shunt reservoir.](6a5a42a2-43a2-4fe6-8dd5-b2b1fc3e83fd)
**CSF Shunts and Complications**
*Axial T2 MR demonstrates a shunt catheter in the right lateral ventricle <img src='/img/arrows/CS.png'/> with asymmetric lateral ventricles due to overdrainage of the right <img src='/img/arrows/CO.png'/> and mild underdrainage of the left <img src='/img/arrows/CC.png'/>. Note susceptibility artifact <img src='/img/arrows/WS.png'/> due to the shunt reservoir.*
*Axial T2 MR demonstrates a shunt catheter in the right lateral ventricle <img src='img/arrows/CS.png'/> with asymmetric lateral ventricles due to overdrainage of the right <img src='img/arrows/CO.png'/> and mild underdrainage of the left <img src='img/arrows/CC.png'/>. Note susceptibility artifact <img src='img/arrows/WS.png'/> due to the shunt reservoir.*
![Axial T2 MR demonstrates a left lateral intraventricular isointense mass <img src='/img/arrows/CO.png'/> in the trigone with dilatation of the left trigone <img src='/img/arrows/CS.png'/>. Note periventricular edema <img src='/img/arrows/CC.png'/>. Biopsy revealed meningioma.](c60f5671-0335-43af-8efa-e151dbc51c78)
![Axial T2 MR demonstrates a left lateral intraventricular isointense mass <img src='img/arrows/CO.png'/> in the trigone with dilatation of the left trigone <img src='img/arrows/CS.png'/>. Note periventricular edema <img src='img/arrows/CC.png'/>. Biopsy revealed meningioma.](c60f5671-0335-43af-8efa-e151dbc51c78)
**Meningioma**
*Axial T2 MR demonstrates a left lateral intraventricular isointense mass <img src='/img/arrows/CO.png'/> in the trigone with dilatation of the left trigone <img src='/img/arrows/CS.png'/>. Note periventricular edema <img src='/img/arrows/CC.png'/>. Biopsy revealed meningioma.*
*Axial T2 MR demonstrates a left lateral intraventricular isointense mass <img src='img/arrows/CO.png'/> in the trigone with dilatation of the left trigone <img src='img/arrows/CS.png'/>. Note periventricular edema <img src='img/arrows/CC.png'/>. Biopsy revealed meningioma.*
![Axial T2 MR demonstrates a well-circumscribed, isointense, left lateral ventricular mass <img src='/img/arrows/CS.png'/> attached to the septum pellucidum with peripheral tiny cysts <img src='/img/arrows/CC.png'/>. Note moderate dilation of the left lateral ventricle <img src='/img/arrows/CO.png'/>. Biopsy revealed neurocytoma.](ebb2adb7-6287-41d0-8a41-de9563c420d8)
![Axial T2 MR demonstrates a well-circumscribed, isointense, left lateral ventricular mass <img src='img/arrows/CS.png'/> attached to the septum pellucidum with peripheral tiny cysts <img src='img/arrows/CC.png'/>. Note moderate dilation of the left lateral ventricle <img src='img/arrows/CO.png'/>. Biopsy revealed neurocytoma.](ebb2adb7-6287-41d0-8a41-de9563c420d8)
**Neurocytoma, Central**
*Axial T2 MR demonstrates a well-circumscribed, isointense, left lateral ventricular mass <img src='/img/arrows/CS.png'/> attached to the septum pellucidum with peripheral tiny cysts <img src='/img/arrows/CC.png'/>. Note moderate dilation of the left lateral ventricle <img src='/img/arrows/CO.png'/>. Biopsy revealed neurocytoma.*
*Axial T2 MR demonstrates a well-circumscribed, isointense, left lateral ventricular mass <img src='img/arrows/CS.png'/> attached to the septum pellucidum with peripheral tiny cysts <img src='img/arrows/CC.png'/>. Note moderate dilation of the left lateral ventricle <img src='img/arrows/CO.png'/>. Biopsy revealed neurocytoma.*
![Coronal T2 MR demonstrates asymmetric mild enlargement of the left lateral ventricle <img src='/img/arrows/CO.png'/> due to synechiae <img src='/img/arrows/CS.png'/> obstructing the foramen of Monro.](a22d935b-ac47-4f41-8b5d-57d599e0d11f)
![Coronal T2 MR demonstrates asymmetric mild enlargement of the left lateral ventricle <img src='img/arrows/CO.png'/> due to synechiae <img src='img/arrows/CS.png'/> obstructing the foramen of Monro.](a22d935b-ac47-4f41-8b5d-57d599e0d11f)
**Intraventricular Synechiae/Adhesions**
*Coronal T2 MR demonstrates asymmetric mild enlargement of the left lateral ventricle <img src='/img/arrows/CO.png'/> due to synechiae <img src='/img/arrows/CS.png'/> obstructing the foramen of Monro.*
*Coronal T2 MR demonstrates asymmetric mild enlargement of the left lateral ventricle <img src='img/arrows/CO.png'/> due to synechiae <img src='img/arrows/CS.png'/> obstructing the foramen of Monro.*
![Axial T2 MR demonstrates a poorly circumscribed heterogeneous left trigonal mass <img src='/img/arrows/CO.png'/> with internal cysts/necrosis. Note extensive periventricular edema <img src='/img/arrows/CC.png'/>. Biopsy revealed choroid plexus carcinoma.](77fdb2fd-452d-4226-b341-62bf87689ec5)
![Axial T2 MR demonstrates a poorly circumscribed heterogeneous left trigonal mass <img src='img/arrows/CO.png'/> with internal cysts/necrosis. Note extensive periventricular edema <img src='img/arrows/CC.png'/>. Biopsy revealed choroid plexus carcinoma.](77fdb2fd-452d-4226-b341-62bf87689ec5)
**Choroid Plexus Carcinoma**
*Axial T2 MR demonstrates a poorly circumscribed heterogeneous left trigonal mass <img src='/img/arrows/CO.png'/> with internal cysts/necrosis. Note extensive periventricular edema <img src='/img/arrows/CC.png'/>. Biopsy revealed choroid plexus carcinoma.*
*Axial T2 MR demonstrates a poorly circumscribed heterogeneous left trigonal mass <img src='img/arrows/CO.png'/> with internal cysts/necrosis. Note extensive periventricular edema <img src='img/arrows/CC.png'/>. Biopsy revealed choroid plexus carcinoma.*
![Axial NECT demonstrates atrophy of the left cerebral hemisphere with encephalomalacia due to antenatal vascular insult. Note the dilated left lateral ventricle <img src='/img/arrows/CS.png'/> and mild overlying calvarial thickening <img src='/img/arrows/CO.png'/>.](71a10f6b-7ad7-4e54-98ae-1784130732b9)
![Axial NECT demonstrates atrophy of the left cerebral hemisphere with encephalomalacia due to antenatal vascular insult. Note the dilated left lateral ventricle <img src='img/arrows/CS.png'/> and mild overlying calvarial thickening <img src='img/arrows/CO.png'/>.](71a10f6b-7ad7-4e54-98ae-1784130732b9)
**Dyke-Davidoff-Masson**
*Axial NECT demonstrates atrophy of the left cerebral hemisphere with encephalomalacia due to antenatal vascular insult. Note the dilated left lateral ventricle <img src='/img/arrows/CS.png'/> and mild overlying calvarial thickening <img src='/img/arrows/CO.png'/>.*
*Axial NECT demonstrates atrophy of the left cerebral hemisphere with encephalomalacia due to antenatal vascular insult. Note the dilated left lateral ventricle <img src='img/arrows/CS.png'/> and mild overlying calvarial thickening <img src='img/arrows/CO.png'/>.*
![Axial T2 MR in a patient with refractory epilepsy due to Rasmussen encephalitis demonstrates left cerebral hemispheric atrophy <img src='/img/arrows/CC.png'/> and mild ex-vacuo dilation of the left lateral ventricle <img src='/img/arrows/CS.png'/>.](71509045-9597-44be-b81f-44e0bc95be4e)
![Axial T2 MR in a patient with refractory epilepsy due to Rasmussen encephalitis demonstrates left cerebral hemispheric atrophy <img src='img/arrows/CC.png'/> and mild ex-vacuo dilation of the left lateral ventricle <img src='img/arrows/CS.png'/>.](71509045-9597-44be-b81f-44e0bc95be4e)
**Rasmussen Encephalitis**
*Axial T2 MR in a patient with refractory epilepsy due to Rasmussen encephalitis demonstrates left cerebral hemispheric atrophy <img src='/img/arrows/CC.png'/> and mild ex-vacuo dilation of the left lateral ventricle <img src='/img/arrows/CS.png'/>.*
*Axial T2 MR in a patient with refractory epilepsy due to Rasmussen encephalitis demonstrates left cerebral hemispheric atrophy <img src='img/arrows/CC.png'/> and mild ex-vacuo dilation of the left lateral ventricle <img src='img/arrows/CS.png'/>.*
### Additional Images
![Axial T1WI C+ MR shows compression of the left frontal horn <img src='/img/arrows/WS.png'/> by a large, periventricular, enhancing mass <img src='/img/arrows/WC.png'/>, primary CNS lymphoma. Extrinsic mass effect is a common cause of ventricular asymmetry.](images/app.statdx.com_image_thumbnail_9c7a2c27-fa74-474a-a33e-3cfbf2329f76_annotated_true_size_900_quality_90_8cafe5b4_20251018T165124Z.jpg)
![Axial T1WI C+ MR shows compression of the left frontal horn <img src='img/arrows/WS.png'/> by a large, periventricular, enhancing mass <img src='img/arrows/WC.png'/>, primary CNS lymphoma. Extrinsic mass effect is a common cause of ventricular asymmetry.](images/app.statdx.com_image_thumbnail_9c7a2c27-fa74-474a-a33e-3cfbf2329f76_annotated_true_size_900_quality_90_8cafe5b4_20251018T165124Z.jpg)
**Extrinsic Mass Effect**
*Axial T1WI C+ MR shows compression of the left frontal horn <img src='/img/arrows/WS.png'/> by a large, periventricular, enhancing mass <img src='/img/arrows/WC.png'/>, primary CNS lymphoma. Extrinsic mass effect is a common cause of ventricular asymmetry.*
*Axial T1WI C+ MR shows compression of the left frontal horn <img src='img/arrows/WS.png'/> by a large, periventricular, enhancing mass <img src='img/arrows/WC.png'/>, primary CNS lymphoma. Extrinsic mass effect is a common cause of ventricular asymmetry.*
![Axial FLAIR MR demonstrates a left posterior MCA encephalomalacia <img src='/img/arrows/WS.png'/> resulting in mild ex-vacuo dilatation of the left atrium <img src='/img/arrows/WO.png'/>.](images/app.statdx.com_image_thumbnail_d875dfa4-5133-4dd6-9471-a019de504b4a_annotated_true_size_900_quality_90_e15566aa_20251018T165124Z.jpg)
![Axial FLAIR MR demonstrates a left posterior MCA encephalomalacia <img src='img/arrows/WS.png'/> resulting in mild ex-vacuo dilatation of the left atrium <img src='img/arrows/WO.png'/>.](images/app.statdx.com_image_thumbnail_d875dfa4-5133-4dd6-9471-a019de504b4a_annotated_true_size_900_quality_90_e15566aa_20251018T165124Z.jpg)
**Encephalomalacia, General**
*Axial FLAIR MR demonstrates a left posterior MCA encephalomalacia <img src='/img/arrows/WS.png'/> resulting in mild ex-vacuo dilatation of the left atrium <img src='/img/arrows/WO.png'/>.*
*Axial FLAIR MR demonstrates a left posterior MCA encephalomalacia <img src='img/arrows/WS.png'/> resulting in mild ex-vacuo dilatation of the left atrium <img src='img/arrows/WO.png'/>.*
![Axial T2 MR shows right hemiatrophy in Sturge-Weber syndrome. Chronic venous ischemia leads to progressive hemiatrophy. Note the ipsilateral large right ventricle <img src='/img/arrows/WO.png'/> due to volume loss.](images/app.statdx.com_image_thumbnail_370d0b50-9617-4697-8005-d759cf146130_annotated_true_size_900_quality_90_83c359ec_20251018T165124Z.jpg)
![Axial T2 MR shows right hemiatrophy in Sturge-Weber syndrome. Chronic venous ischemia leads to progressive hemiatrophy. Note the ipsilateral large right ventricle <img src='img/arrows/WO.png'/> due to volume loss.](images/app.statdx.com_image_thumbnail_370d0b50-9617-4697-8005-d759cf146130_annotated_true_size_900_quality_90_83c359ec_20251018T165124Z.jpg)
**Encephalomalacia, General**
*Axial T2 MR shows right hemiatrophy in Sturge-Weber syndrome. Chronic venous ischemia leads to progressive hemiatrophy. Note the ipsilateral large right ventricle <img src='/img/arrows/WO.png'/> due to volume loss.*
*Axial T2 MR shows right hemiatrophy in Sturge-Weber syndrome. Chronic venous ischemia leads to progressive hemiatrophy. Note the ipsilateral large right ventricle <img src='img/arrows/WO.png'/> due to volume loss.*
![Axial NECT shows a basal ganglia hypertensive hemorrhage <img src='/img/arrows/WS.png'/> with intraventricular extension <img src='/img/arrows/WO.png'/>. Associated midline shift results in dilation of the contralateral ventricles <img src='/img/arrows/WC.png'/> from foramen of Monro obstruction.](4897b7a6-5a0f-49c0-8a96-26f7653455b6)
![Axial NECT shows a basal ganglia hypertensive hemorrhage <img src='img/arrows/WS.png'/> with intraventricular extension <img src='img/arrows/WO.png'/>. Associated midline shift results in dilation of the contralateral ventricles <img src='img/arrows/WC.png'/> from foramen of Monro obstruction.](4897b7a6-5a0f-49c0-8a96-26f7653455b6)
**Intraventricular Hemorrhage**
*Axial NECT shows a basal ganglia hypertensive hemorrhage <img src='/img/arrows/WS.png'/> with intraventricular extension <img src='/img/arrows/WO.png'/>. Associated midline shift results in dilation of the contralateral ventricles <img src='/img/arrows/WC.png'/> from foramen of Monro obstruction.*
*Axial NECT shows a basal ganglia hypertensive hemorrhage <img src='img/arrows/WS.png'/> with intraventricular extension <img src='img/arrows/WO.png'/>. Associated midline shift results in dilation of the contralateral ventricles <img src='img/arrows/WC.png'/> from foramen of Monro obstruction.*
![Coronal FLAIR MR shows a diffusely enlarged hyperintense supratentorial cortex <img src='/img/arrows/WS.png'/> compared to the cerebellum in this patient in longstanding status epilepticus. Disproportionate left hemisphere involvement has resulted in left ventricular compression <img src='/img/arrows/WO.png'/>, right foramen of Monro outlet obstruction, and dilation of the right ventricular system <img src='/img/arrows/WC.png'/>.](b73d4ba3-3f44-41f0-8763-5a8ef431e21a)
![Coronal FLAIR MR shows a diffusely enlarged hyperintense supratentorial cortex <img src='img/arrows/WS.png'/> compared to the cerebellum in this patient in longstanding status epilepticus. Disproportionate left hemisphere involvement has resulted in left ventricular compression <img src='img/arrows/WO.png'/>, right foramen of Monro outlet obstruction, and dilation of the right ventricular system <img src='img/arrows/WC.png'/>.](b73d4ba3-3f44-41f0-8763-5a8ef431e21a)
**Herniation Syndromes, Intracranial**
*Coronal FLAIR MR shows a diffusely enlarged hyperintense supratentorial cortex <img src='/img/arrows/WS.png'/> compared to the cerebellum in this patient in longstanding status epilepticus. Disproportionate left hemisphere involvement has resulted in left ventricular compression <img src='/img/arrows/WO.png'/>, right foramen of Monro outlet obstruction, and dilation of the right ventricular system <img src='/img/arrows/WC.png'/>.*
*Coronal FLAIR MR shows a diffusely enlarged hyperintense supratentorial cortex <img src='img/arrows/WS.png'/> compared to the cerebellum in this patient in longstanding status epilepticus. Disproportionate left hemisphere involvement has resulted in left ventricular compression <img src='img/arrows/WO.png'/>, right foramen of Monro outlet obstruction, and dilation of the right ventricular system <img src='img/arrows/WC.png'/>.*
![Coronal T1WI C+ MR shows a right hemispheric, subacute, subdural hematoma causing subfalcine <img src='/img/arrows/WC.png'/> and uncal <img src='/img/arrows/WO.png'/> herniation. Mass effect compresses the right frontal horn. The left ventricle <img src='/img/arrows/BO.png'/> is enlarged from foramen of Monro obstruction.](babb7bb2-a880-4e0d-84e4-a4a72ba57ee1)
![Coronal T1WI C+ MR shows a right hemispheric, subacute, subdural hematoma causing subfalcine <img src='img/arrows/WC.png'/> and uncal <img src='img/arrows/WO.png'/> herniation. Mass effect compresses the right frontal horn. The left ventricle <img src='img/arrows/BO.png'/> is enlarged from foramen of Monro obstruction.](babb7bb2-a880-4e0d-84e4-a4a72ba57ee1)
**Herniation Syndromes, Intracranial**
*Coronal T1WI C+ MR shows a right hemispheric, subacute, subdural hematoma causing subfalcine <img src='/img/arrows/WC.png'/> and uncal <img src='/img/arrows/WO.png'/> herniation. Mass effect compresses the right frontal horn. The left ventricle <img src='/img/arrows/BO.png'/> is enlarged from foramen of Monro obstruction.*
*Coronal T1WI C+ MR shows a right hemispheric, subacute, subdural hematoma causing subfalcine <img src='img/arrows/WC.png'/> and uncal <img src='img/arrows/WO.png'/> herniation. Mass effect compresses the right frontal horn. The left ventricle <img src='img/arrows/BO.png'/> is enlarged from foramen of Monro obstruction.*
![Coronal T2WI MR shows right temporal viral encephalitis causing local mass effect <img src='/img/arrows/WO.png'/>. The left lateral ventricle <img src='/img/arrows/WS.png'/> is larger from foramen of Monro obstruction due to midline shift.](ac578239-383c-479c-9fd1-ec8b74c4c90d)
![Coronal T2WI MR shows right temporal viral encephalitis causing local mass effect <img src='img/arrows/WO.png'/>. The left lateral ventricle <img src='img/arrows/WS.png'/> is larger from foramen of Monro obstruction due to midline shift.](ac578239-383c-479c-9fd1-ec8b74c4c90d)
**Herniation Syndromes, Intracranial**
*Coronal T2WI MR shows right temporal viral encephalitis causing local mass effect <img src='/img/arrows/WO.png'/>. The left lateral ventricle <img src='/img/arrows/WS.png'/> is larger from foramen of Monro obstruction due to midline shift.*
*Coronal T2WI MR shows right temporal viral encephalitis causing local mass effect <img src='img/arrows/WO.png'/>. The left lateral ventricle <img src='img/arrows/WS.png'/> is larger from foramen of Monro obstruction due to midline shift.*
![Axial T2WI MR shows widening of right foramen of Monro <img src='/img/arrows/WS.png'/>, septum pellucidum deviation <img src='/img/arrows/BS.png'/>, and an enlarged right lateral ventricle <img src='/img/arrows/WO.png'/> in this tuberous sclerosis patient with remote tumor resection.](166a8b5f-51ff-4bff-a262-2f54eae8dec6)
![Axial T2WI MR shows widening of right foramen of Monro <img src='img/arrows/WS.png'/>, septum pellucidum deviation <img src='img/arrows/BS.png'/>, and an enlarged right lateral ventricle <img src='img/arrows/WO.png'/> in this tuberous sclerosis patient with remote tumor resection.](166a8b5f-51ff-4bff-a262-2f54eae8dec6)
**Surgical Defects**
*Axial T2WI MR shows widening of right foramen of Monro <img src='/img/arrows/WS.png'/>, septum pellucidum deviation <img src='/img/arrows/BS.png'/>, and an enlarged right lateral ventricle <img src='/img/arrows/WO.png'/> in this tuberous sclerosis patient with remote tumor resection.*
*Axial T2WI MR shows widening of right foramen of Monro <img src='img/arrows/WS.png'/>, septum pellucidum deviation <img src='img/arrows/BS.png'/>, and an enlarged right lateral ventricle <img src='img/arrows/WO.png'/> in this tuberous sclerosis patient with remote tumor resection.*
![Axial NECT shows marked enlargement of the left lateral ventricle with bowing of septum pellucidum across midline <img src='/img/arrows/WS.png'/> and transependymal CSF migration <img src='/img/arrows/WO.png'/> indicating acute obstruction. Findings were related to a small atrial diverticulum.](111d8d26-88f6-43d3-8ddb-407a85e2707e)
![Axial NECT shows marked enlargement of the left lateral ventricle with bowing of septum pellucidum across midline <img src='img/arrows/WS.png'/> and transependymal CSF migration <img src='img/arrows/WO.png'/> indicating acute obstruction. Findings were related to a small atrial diverticulum.](111d8d26-88f6-43d3-8ddb-407a85e2707e)
**Obstructive Hydrocephalus**
*Axial NECT shows marked enlargement of the left lateral ventricle with bowing of septum pellucidum across midline <img src='/img/arrows/WS.png'/> and transependymal CSF migration <img src='/img/arrows/WO.png'/> indicating acute obstruction. Findings were related to a small atrial diverticulum.*
*Axial NECT shows marked enlargement of the left lateral ventricle with bowing of septum pellucidum across midline <img src='img/arrows/WS.png'/> and transependymal CSF migration <img src='img/arrows/WO.png'/> indicating acute obstruction. Findings were related to a small atrial diverticulum.*
![Axial T1WI C+ MR shows a colloid cyst <img src='/img/arrows/WS.png'/> believed to be complicated by inflammatory changes. Obstruction of the left foramen of Monro causes unilateral left lateral ventricle dilation <img src='/img/arrows/WO.png'/>.](f99e392c-9132-4bdd-b2fb-665f8ff10dd3)
![Axial T1WI C+ MR shows a colloid cyst <img src='img/arrows/WS.png'/> believed to be complicated by inflammatory changes. Obstruction of the left foramen of Monro causes unilateral left lateral ventricle dilation <img src='img/arrows/WO.png'/>.](f99e392c-9132-4bdd-b2fb-665f8ff10dd3)
**Obstructive Hydrocephalus**
*Axial T1WI C+ MR shows a colloid cyst <img src='/img/arrows/WS.png'/> believed to be complicated by inflammatory changes. Obstruction of the left foramen of Monro causes unilateral left lateral ventricle dilation <img src='/img/arrows/WO.png'/>.*
*Axial T1WI C+ MR shows a colloid cyst <img src='img/arrows/WS.png'/> believed to be complicated by inflammatory changes. Obstruction of the left foramen of Monro causes unilateral left lateral ventricle dilation <img src='img/arrows/WO.png'/>.*
![Axial T2WI MR shows a medial atrial diverticulum <img src='/img/arrows/WS.png'/>, a rare complication of severe hydrocephalus. CSF pouch herniates inferomedially through tentorial incisura.](51902a9b-bfb3-4df5-b937-6d3eb682f0f6)
![Axial T2WI MR shows a medial atrial diverticulum <img src='img/arrows/WS.png'/>, a rare complication of severe hydrocephalus. CSF pouch herniates inferomedially through tentorial incisura.](51902a9b-bfb3-4df5-b937-6d3eb682f0f6)
**Obstructive Hydrocephalus**
*Axial T2WI MR shows a medial atrial diverticulum <img src='/img/arrows/WS.png'/>, a rare complication of severe hydrocephalus. CSF pouch herniates inferomedially through tentorial incisura.*
*Axial T2WI MR shows a medial atrial diverticulum <img src='img/arrows/WS.png'/>, a rare complication of severe hydrocephalus. CSF pouch herniates inferomedially through tentorial incisura.*
![Coronal T1WI C+ MR shows typical case of coccidioidomycosis meningitis. Note marked enhancement of basal cisterns <img src='/img/arrows/BS.png'/> and asymmetric ventricular enlargement <img src='/img/arrows/WS.png'/> from CSF obstruction.](c4b489b1-dc1a-4d23-84fc-a62cd35c8b12)
![Coronal T1WI C+ MR shows typical case of coccidioidomycosis meningitis. Note marked enhancement of basal cisterns <img src='img/arrows/BS.png'/> and asymmetric ventricular enlargement <img src='img/arrows/WS.png'/> from CSF obstruction.](c4b489b1-dc1a-4d23-84fc-a62cd35c8b12)
**Obstructive Hydrocephalus**
*Coronal T1WI C+ MR shows typical case of coccidioidomycosis meningitis. Note marked enhancement of basal cisterns <img src='/img/arrows/BS.png'/> and asymmetric ventricular enlargement <img src='/img/arrows/WS.png'/> from CSF obstruction.*
*Coronal T1WI C+ MR shows typical case of coccidioidomycosis meningitis. Note marked enhancement of basal cisterns <img src='img/arrows/BS.png'/> and asymmetric ventricular enlargement <img src='img/arrows/WS.png'/> from CSF obstruction.*
![Axial T1WI C+ MR shows a lobulated, nonenhancing mass <img src='/img/arrows/WS.png'/> in the lateral ventricle atrium, a choroid plexus xanthogranuloma. This degenerative cyst of the choroid plexus is often found incidentally in older patients.](0f9bad8c-233c-480f-adc5-7eb1ab83f856)
![Axial T1WI C+ MR shows a lobulated, nonenhancing mass <img src='img/arrows/WS.png'/> in the lateral ventricle atrium, a choroid plexus xanthogranuloma. This degenerative cyst of the choroid plexus is often found incidentally in older patients.](0f9bad8c-233c-480f-adc5-7eb1ab83f856)
**Choroid Plexus Cyst**
*Axial T1WI C+ MR shows a lobulated, nonenhancing mass <img src='/img/arrows/WS.png'/> in the lateral ventricle atrium, a choroid plexus xanthogranuloma. This degenerative cyst of the choroid plexus is often found incidentally in older patients.*
*Axial T1WI C+ MR shows a lobulated, nonenhancing mass <img src='img/arrows/WS.png'/> in the lateral ventricle atrium, a choroid plexus xanthogranuloma. This degenerative cyst of the choroid plexus is often found incidentally in older patients.*
![Axial T1WI C+ MR shows ventriculitis with asymmetric lateral ventricles related to a temporal lobe abscess <img src='/img/arrows/WS.png'/> rupture and meningitis <img src='/img/arrows/WC.png'/>. Note ventriculomegaly and ventricular wall enhancement <img src='/img/arrows/WO.png'/> characteristic of ventriculitis.](792dc081-566e-4513-987f-ec30914d3bcf)
![Axial T1WI C+ MR shows ventriculitis with asymmetric lateral ventricles related to a temporal lobe abscess <img src='img/arrows/WS.png'/> rupture and meningitis <img src='img/arrows/WC.png'/>. Note ventriculomegaly and ventricular wall enhancement <img src='img/arrows/WO.png'/> characteristic of ventriculitis.](792dc081-566e-4513-987f-ec30914d3bcf)
**Ventriculitis**
*Axial T1WI C+ MR shows ventriculitis with asymmetric lateral ventricles related to a temporal lobe abscess <img src='/img/arrows/WS.png'/> rupture and meningitis <img src='/img/arrows/WC.png'/>. Note ventriculomegaly and ventricular wall enhancement <img src='/img/arrows/WO.png'/> characteristic of ventriculitis.*
*Axial T1WI C+ MR shows ventriculitis with asymmetric lateral ventricles related to a temporal lobe abscess <img src='img/arrows/WS.png'/> rupture and meningitis <img src='img/arrows/WC.png'/>. Note ventriculomegaly and ventricular wall enhancement <img src='img/arrows/WO.png'/> characteristic of ventriculitis.*
![Axial CECT shows marked ventriculomegaly and ependymal enhancement <img src='/img/arrows/WS.png'/>. A dependent debris level <img src='/img/arrows/WC.png'/> is noted in both lateral ventricles. Ventriculitis has resulted from abscess <img src='/img/arrows/WO.png'/> rupture.](288f6dcf-fe0a-4dbf-809a-c0654c4a32c8)
![Axial CECT shows marked ventriculomegaly and ependymal enhancement <img src='img/arrows/WS.png'/>. A dependent debris level <img src='img/arrows/WC.png'/> is noted in both lateral ventricles. Ventriculitis has resulted from abscess <img src='img/arrows/WO.png'/> rupture.](288f6dcf-fe0a-4dbf-809a-c0654c4a32c8)
**Ventriculitis**
*Axial CECT shows marked ventriculomegaly and ependymal enhancement <img src='/img/arrows/WS.png'/>. A dependent debris level <img src='/img/arrows/WC.png'/> is noted in both lateral ventricles. Ventriculitis has resulted from abscess <img src='/img/arrows/WO.png'/> rupture.*
*Axial CECT shows marked ventriculomegaly and ependymal enhancement <img src='img/arrows/WS.png'/>. A dependent debris level <img src='img/arrows/WC.png'/> is noted in both lateral ventricles. Ventriculitis has resulted from abscess <img src='img/arrows/WO.png'/> rupture.*
![Axial NECT shows an infant with hydrocephalus after placement of a right frontal ventricular drain <img src='/img/arrows/WS.png'/>. The shunt did not cross midline. The left lateral ventricle remained enlarged, and the right became slit-like.](5fc74921-60fe-4ec5-b99e-8667a5b6d288)
![Axial NECT shows an infant with hydrocephalus after placement of a right frontal ventricular drain <img src='img/arrows/WS.png'/>. The shunt did not cross midline. The left lateral ventricle remained enlarged, and the right became slit-like.](5fc74921-60fe-4ec5-b99e-8667a5b6d288)
**CSF Shunts and Complications**
*Axial NECT shows an infant with hydrocephalus after placement of a right frontal ventricular drain <img src='/img/arrows/WS.png'/>. The shunt did not cross midline. The left lateral ventricle remained enlarged, and the right became slit-like.*
*Axial NECT shows an infant with hydrocephalus after placement of a right frontal ventricular drain <img src='img/arrows/WS.png'/>. The shunt did not cross midline. The left lateral ventricle remained enlarged, and the right became slit-like.*
![Axial T2WI MR shows marked enlargement of the isolated right lateral ventricle with transependymal flow of CSF <img src='/img/arrows/WC.png'/> indicating acute obstruction. Note left shunt <img src='/img/arrows/WS.png'/> and completely decompressed left lateral ventricle.](ce67f32e-2900-499f-8122-83108e8cb3f9)
![Axial T2WI MR shows marked enlargement of the isolated right lateral ventricle with transependymal flow of CSF <img src='img/arrows/WC.png'/> indicating acute obstruction. Note left shunt <img src='img/arrows/WS.png'/> and completely decompressed left lateral ventricle.](ce67f32e-2900-499f-8122-83108e8cb3f9)
**CSF Shunts and Complications**
*Axial T2WI MR shows marked enlargement of the isolated right lateral ventricle with transependymal flow of CSF <img src='/img/arrows/WC.png'/> indicating acute obstruction. Note left shunt <img src='/img/arrows/WS.png'/> and completely decompressed left lateral ventricle.*
*Axial T2WI MR shows marked enlargement of the isolated right lateral ventricle with transependymal flow of CSF <img src='img/arrows/WC.png'/> indicating acute obstruction. Note left shunt <img src='img/arrows/WS.png'/> and completely decompressed left lateral ventricle.*
![Axial NECT shows asymmetric left ventricular dilation <img src='/img/arrows/WS.png'/> post shunting <img src='/img/arrows/WO.png'/>. Shunt tip may be occluded from clot <img src='/img/arrows/WC.png'/> or from imperforate septum, preventing drainage of the left ventricular system.](d7b146cb-1f10-4d4a-a067-85779240fbfb)
![Axial NECT shows asymmetric left ventricular dilation <img src='img/arrows/WS.png'/> post shunting <img src='img/arrows/WO.png'/>. Shunt tip may be occluded from clot <img src='img/arrows/WC.png'/> or from imperforate septum, preventing drainage of the left ventricular system.](d7b146cb-1f10-4d4a-a067-85779240fbfb)
**CSF Shunts and Complications**
*Axial NECT shows asymmetric left ventricular dilation <img src='/img/arrows/WS.png'/> post shunting <img src='/img/arrows/WO.png'/>. Shunt tip may be occluded from clot <img src='/img/arrows/WC.png'/> or from imperforate septum, preventing drainage of the left ventricular system.*
*Axial NECT shows asymmetric left ventricular dilation <img src='img/arrows/WS.png'/> post shunting <img src='img/arrows/WO.png'/>. Shunt tip may be occluded from clot <img src='img/arrows/WC.png'/> or from imperforate septum, preventing drainage of the left ventricular system.*
![Axial T2WI FS MR shows a hypointense choroid plexus mass <img src='/img/arrows/WS.png'/> in the atrium of the left lateral ventricle that enhanced intensely (not shown). Note striking surrounding vasogenic edema <img src='/img/arrows/WC.png'/> in adjacent brain parenchyma, thought due to locally obstructed CSF.](d39a3243-21fc-4d93-9a3e-85e6a329c81d)
![Axial T2WI FS MR shows a hypointense choroid plexus mass <img src='img/arrows/WS.png'/> in the atrium of the left lateral ventricle that enhanced intensely (not shown). Note striking surrounding vasogenic edema <img src='img/arrows/WC.png'/> in adjacent brain parenchyma, thought due to locally obstructed CSF.](d39a3243-21fc-4d93-9a3e-85e6a329c81d)
**Meningioma**
*Axial T2WI FS MR shows a hypointense choroid plexus mass <img src='/img/arrows/WS.png'/> in the atrium of the left lateral ventricle that enhanced intensely (not shown). Note striking surrounding vasogenic edema <img src='/img/arrows/WC.png'/> in adjacent brain parenchyma, thought due to locally obstructed CSF.*
*Axial T2WI FS MR shows a hypointense choroid plexus mass <img src='img/arrows/WS.png'/> in the atrium of the left lateral ventricle that enhanced intensely (not shown). Note striking surrounding vasogenic edema <img src='img/arrows/WC.png'/> in adjacent brain parenchyma, thought due to locally obstructed CSF.*
![Axial T1WI C+ MR demonstrates a mildly enhancing and heterogeneous mass arising from the septum pellucidum <img src='/img/arrows/WS.png'/>. Note asymmetric dilatation of the right lateral ventricle <img src='/img/arrows/WO.png'/>.](1c64172a-f7fe-40df-8387-08f484c5cbad)
![Axial T1WI C+ MR demonstrates a mildly enhancing and heterogeneous mass arising from the septum pellucidum <img src='img/arrows/WS.png'/>. Note asymmetric dilatation of the right lateral ventricle <img src='img/arrows/WO.png'/>.](1c64172a-f7fe-40df-8387-08f484c5cbad)
**Neurocytoma, Central**
*Axial T1WI C+ MR demonstrates a mildly enhancing and heterogeneous mass arising from the septum pellucidum <img src='/img/arrows/WS.png'/>. Note asymmetric dilatation of the right lateral ventricle <img src='/img/arrows/WO.png'/>.*
*Axial T1WI C+ MR demonstrates a mildly enhancing and heterogeneous mass arising from the septum pellucidum <img src='img/arrows/WS.png'/>. Note asymmetric dilatation of the right lateral ventricle <img src='img/arrows/WO.png'/>.*
![Axial T1WI C+ MR shows enhancement within the mass in the atrium of the lateral ventricle <img src='/img/arrows/WS.png'/> with an encysted asymmetrically larger left lateral ventricle.](4df1735f-b3a7-4ab4-9e73-ce5d331abb62)
![Axial T1WI C+ MR shows enhancement within the mass in the atrium of the lateral ventricle <img src='img/arrows/WS.png'/> with an encysted asymmetrically larger left lateral ventricle.](4df1735f-b3a7-4ab4-9e73-ce5d331abb62)
**Choroid Plexus Papilloma**
*Axial T1WI C+ MR shows enhancement within the mass in the atrium of the lateral ventricle <img src='/img/arrows/WS.png'/> with an encysted asymmetrically larger left lateral ventricle.*
*Axial T1WI C+ MR shows enhancement within the mass in the atrium of the lateral ventricle <img src='img/arrows/WS.png'/> with an encysted asymmetrically larger left lateral ventricle.*
![Axial T1WI C+ MR shows asymmetric lateral ventricles caused by a giant neurocysticercosis cyst <img src='/img/arrows/WS.png'/> in the body of the left lateral ventricle.](fcfcfeb1-c938-47be-ba9e-a639c55bbdd3)
![Axial T1WI C+ MR shows asymmetric lateral ventricles caused by a giant neurocysticercosis cyst <img src='img/arrows/WS.png'/> in the body of the left lateral ventricle.](fcfcfeb1-c938-47be-ba9e-a639c55bbdd3)
**Neurocysticercosis**
*Axial T1WI C+ MR shows asymmetric lateral ventricles caused by a giant neurocysticercosis cyst <img src='/img/arrows/WS.png'/> in the body of the left lateral ventricle.*
*Axial T1WI C+ MR shows asymmetric lateral ventricles caused by a giant neurocysticercosis cyst <img src='img/arrows/WS.png'/> in the body of the left lateral ventricle.*
![Axial T1WI C+ FS MR shows a large mass in the atrium of the right lateral ventricle <img src='/img/arrows/WC.png'/> with a trapped, encysted occipital horn <img src='/img/arrows/WO.png'/>. Ependymal enhancement represents tumor spread from choroidal metastasis.](2bb8e963-0d65-4974-ae8d-429abcee49df)
![Axial T1WI C+ FS MR shows a large mass in the atrium of the right lateral ventricle <img src='img/arrows/WC.png'/> with a trapped, encysted occipital horn <img src='img/arrows/WO.png'/>. Ependymal enhancement represents tumor spread from choroidal metastasis.](2bb8e963-0d65-4974-ae8d-429abcee49df)
**Intraventricular Synechiae/Adhesions**
*Axial T1WI C+ FS MR shows a large mass in the atrium of the right lateral ventricle <img src='/img/arrows/WC.png'/> with a trapped, encysted occipital horn <img src='/img/arrows/WO.png'/>. Ependymal enhancement represents tumor spread from choroidal metastasis.*
*Axial T1WI C+ FS MR shows a large mass in the atrium of the right lateral ventricle <img src='img/arrows/WC.png'/> with a trapped, encysted occipital horn <img src='img/arrows/WO.png'/>. Ependymal enhancement represents tumor spread from choroidal metastasis.*
![Axial T1WI C+ MR shows an asymmetrically larger right atrium <img src='/img/arrows/WS.png'/> in this patient with Sturge-Weber syndrome. Note associated ipsilateral enlarged frontal sinus <img src='/img/arrows/BO.png'/> and calvarial thickening <img src='/img/arrows/BC.png'/>.](29370a1b-3c42-4629-8032-765ef4ce7c56)
![Axial T1WI C+ MR shows an asymmetrically larger right atrium <img src='img/arrows/WS.png'/> in this patient with Sturge-Weber syndrome. Note associated ipsilateral enlarged frontal sinus <img src='img/arrows/BO.png'/> and calvarial thickening <img src='img/arrows/BC.png'/>.](29370a1b-3c42-4629-8032-765ef4ce7c56)
**Dyke-Davidoff-Masson**
*Axial T1WI C+ MR shows an asymmetrically larger right atrium <img src='/img/arrows/WS.png'/> in this patient with Sturge-Weber syndrome. Note associated ipsilateral enlarged frontal sinus <img src='/img/arrows/BO.png'/> and calvarial thickening <img src='/img/arrows/BC.png'/>.*
*Axial T1WI C+ MR shows an asymmetrically larger right atrium <img src='img/arrows/WS.png'/> in this patient with Sturge-Weber syndrome. Note associated ipsilateral enlarged frontal sinus <img src='img/arrows/BO.png'/> and calvarial thickening <img src='img/arrows/BC.png'/>.*
![Axial CECT shows enlargement of the right hemisphere and lateral ventricle <img src='/img/arrows/WS.png'/> compared to the left side. Expansion of the hemisphere is mostly due to increased white matter. An enlarged, often deformed, lateral ventricle on the abnormal side is typical.](9a0ef691-0fe7-474a-86d7-121a23736b79)
![Axial CECT shows enlargement of the right hemisphere and lateral ventricle <img src='img/arrows/WS.png'/> compared to the left side. Expansion of the hemisphere is mostly due to increased white matter. An enlarged, often deformed, lateral ventricle on the abnormal side is typical.](9a0ef691-0fe7-474a-86d7-121a23736b79)
**Hemimegalencephaly**
*Axial CECT shows enlargement of the right hemisphere and lateral ventricle <img src='/img/arrows/WS.png'/> compared to the left side. Expansion of the hemisphere is mostly due to increased white matter. An enlarged, often deformed, lateral ventricle on the abnormal side is typical.*
*Axial CECT shows enlargement of the right hemisphere and lateral ventricle <img src='img/arrows/WS.png'/> compared to the left side. Expansion of the hemisphere is mostly due to increased white matter. An enlarged, often deformed, lateral ventricle on the abnormal side is typical.*
![Axial FLAIR MR shows a cyst enlarging the left lateral ventricle with signal intensity isointense to CSF <img src='/img/arrows/WS.png'/>. There was no enhancement of the cyst wall, typical of ependymal cyst.](5dc6448b-9e90-480c-92c4-b59914acd3c2)
![Axial FLAIR MR shows a cyst enlarging the left lateral ventricle with signal intensity isointense to CSF <img src='img/arrows/WS.png'/>. There was no enhancement of the cyst wall, typical of ependymal cyst.](5dc6448b-9e90-480c-92c4-b59914acd3c2)
**Ependymal Cyst**
*Axial FLAIR MR shows a cyst enlarging the left lateral ventricle with signal intensity isointense to CSF <img src='/img/arrows/WS.png'/>. There was no enhancement of the cyst wall, typical of ependymal cyst.*
*Axial FLAIR MR shows a cyst enlarging the left lateral ventricle with signal intensity isointense to CSF <img src='img/arrows/WS.png'/>. There was no enhancement of the cyst wall, typical of ependymal cyst.*
![Axial FLAIR MR shows a cystic lesion arising from the ependymal lining of the left temporal horn <img src='/img/arrows/CS.png'/>, consistent with an ependymal cyst. The lesion followed CSF signal on every sequence.](6b71914c-51db-4512-973b-d4b49427919c)
![Axial FLAIR MR shows a cystic lesion arising from the ependymal lining of the left temporal horn <img src='img/arrows/CS.png'/>, consistent with an ependymal cyst. The lesion followed CSF signal on every sequence.](6b71914c-51db-4512-973b-d4b49427919c)
**Ependymal Cyst**
*Axial FLAIR MR shows a cystic lesion arising from the ependymal lining of the left temporal horn <img src='/img/arrows/CS.png'/>, consistent with an ependymal cyst. The lesion followed CSF signal on every sequence.*
*Axial FLAIR MR shows a cystic lesion arising from the ependymal lining of the left temporal horn <img src='img/arrows/CS.png'/>, consistent with an ependymal cyst. The lesion followed CSF signal on every sequence.*
![Axial T1WI MR demonstrates a right parietal shunt catheter with its tip <img src='/img/arrows/WS.png'/> in the right frontal horn in a patient with congenital aqueductal stenosis. The right lateral ventricle is collapsed, while the 3rd <img src='/img/arrows/CO.png'/> and left lateral ventricles <img src='/img/arrows/CC.png'/> are moderately dilated.](a93b23ad-da88-4c04-9b31-d3a582cad7c2)
![Axial T1WI MR demonstrates a right parietal shunt catheter with its tip <img src='img/arrows/WS.png'/> in the right frontal horn in a patient with congenital aqueductal stenosis. The right lateral ventricle is collapsed, while the 3rd <img src='img/arrows/CO.png'/> and left lateral ventricles <img src='img/arrows/CC.png'/> are moderately dilated.](a93b23ad-da88-4c04-9b31-d3a582cad7c2)
**CSF Shunts and Complications**
*Axial T1WI MR demonstrates a right parietal shunt catheter with its tip <img src='/img/arrows/WS.png'/> in the right frontal horn in a patient with congenital aqueductal stenosis. The right lateral ventricle is collapsed, while the 3rd <img src='/img/arrows/CO.png'/> and left lateral ventricles <img src='/img/arrows/CC.png'/> are moderately dilated.*
*Axial T1WI MR demonstrates a right parietal shunt catheter with its tip <img src='img/arrows/WS.png'/> in the right frontal horn in a patient with congenital aqueductal stenosis. The right lateral ventricle is collapsed, while the 3rd <img src='img/arrows/CO.png'/> and left lateral ventricles <img src='img/arrows/CC.png'/> are moderately dilated.*
![Axial T1WI C+ MR shows ependymal enhancement and mild asymmetric dilatation of the left occipital horn <img src='/img/arrows/CO.png'/> in ventriculitis. There is also asymmetric enhancement of the adjacent choroid plexus consistent with choroid plexitis <img src='/img/arrows/WO.png'/>.](00e493e3-51d9-420f-be10-b731a98a2fc1)
![Axial T1WI C+ MR shows ependymal enhancement and mild asymmetric dilatation of the left occipital horn <img src='img/arrows/CO.png'/> in ventriculitis. There is also asymmetric enhancement of the adjacent choroid plexus consistent with choroid plexitis <img src='img/arrows/WO.png'/>.](00e493e3-51d9-420f-be10-b731a98a2fc1)
**Ventriculitis**
*Axial T1WI C+ MR shows ependymal enhancement and mild asymmetric dilatation of the left occipital horn <img src='/img/arrows/CO.png'/> in ventriculitis. There is also asymmetric enhancement of the adjacent choroid plexus consistent with choroid plexitis <img src='/img/arrows/WO.png'/>.*
*Axial T1WI C+ MR shows ependymal enhancement and mild asymmetric dilatation of the left occipital horn <img src='img/arrows/CO.png'/> in ventriculitis. There is also asymmetric enhancement of the adjacent choroid plexus consistent with choroid plexitis <img src='img/arrows/WO.png'/>.*
![Axial T2WI MR shows a large, hyperintense choroid plexus cyst <img src='/img/arrows/CS.png'/> in a newborn. The lesion increased in size on sequential imaging, requiring endoscopic fenestration.](273e2721-a959-4b65-82dd-32f8f9fa8623)
![Axial T2WI MR shows a large, hyperintense choroid plexus cyst <img src='img/arrows/CS.png'/> in a newborn. The lesion increased in size on sequential imaging, requiring endoscopic fenestration.](273e2721-a959-4b65-82dd-32f8f9fa8623)
**Choroid Plexus Cyst**
*Axial T2WI MR shows a large, hyperintense choroid plexus cyst <img src='/img/arrows/CS.png'/> in a newborn. The lesion increased in size on sequential imaging, requiring endoscopic fenestration.*
*Axial T2WI MR shows a large, hyperintense choroid plexus cyst <img src='img/arrows/CS.png'/> in a newborn. The lesion increased in size on sequential imaging, requiring endoscopic fenestration.*
![Axial FLAIR MR shows asymmetric dilatation of the left frontal horn <img src='/img/arrows/CS.png'/> and surrounding gliosis following the resection of an intraaxial metastasis. Part of the surgical tract is seen <img src='/img/arrows/CO.png'/>. Note multiple additional metastatic lesions <img src='/img/arrows/WS.png'/> in the right cerebral hemisphere.](53f0bb77-3081-483a-ba27-25e293db386b)
![Axial FLAIR MR shows asymmetric dilatation of the left frontal horn <img src='img/arrows/CS.png'/> and surrounding gliosis following the resection of an intraaxial metastasis. Part of the surgical tract is seen <img src='img/arrows/CO.png'/>. Note multiple additional metastatic lesions <img src='img/arrows/WS.png'/> in the right cerebral hemisphere.](53f0bb77-3081-483a-ba27-25e293db386b)
**Surgical Defects**
*Axial FLAIR MR shows asymmetric dilatation of the left frontal horn <img src='/img/arrows/CS.png'/> and surrounding gliosis following the resection of an intraaxial metastasis. Part of the surgical tract is seen <img src='/img/arrows/CO.png'/>. Note multiple additional metastatic lesions <img src='/img/arrows/WS.png'/> in the right cerebral hemisphere.*
*Axial FLAIR MR shows asymmetric dilatation of the left frontal horn <img src='img/arrows/CS.png'/> and surrounding gliosis following the resection of an intraaxial metastasis. Part of the surgical tract is seen <img src='img/arrows/CO.png'/>. Note multiple additional metastatic lesions <img src='img/arrows/WS.png'/> in the right cerebral hemisphere.*
![Axial NECT demonstrates a large left frontal intraparenchymal hematoma <img src='/img/arrows/BO.png'/> causing subfalcine herniation to the right <img src='/img/arrows/CS.png'/>. The left lateral ventricle is effaced. The posterior right lateral ventricle is mildly dilated <img src='/img/arrows/CO.png'/>.](2ed18dfe-fece-449e-806e-9274ebd2cdd6)
![Axial NECT demonstrates a large left frontal intraparenchymal hematoma <img src='img/arrows/BO.png'/> causing subfalcine herniation to the right <img src='img/arrows/CS.png'/>. The left lateral ventricle is effaced. The posterior right lateral ventricle is mildly dilated <img src='img/arrows/CO.png'/>.](2ed18dfe-fece-449e-806e-9274ebd2cdd6)
**Herniation Syndromes, Intracranial**
*Axial NECT demonstrates a large left frontal intraparenchymal hematoma <img src='/img/arrows/BO.png'/> causing subfalcine herniation to the right <img src='/img/arrows/CS.png'/>. The left lateral ventricle is effaced. The posterior right lateral ventricle is mildly dilated <img src='/img/arrows/CO.png'/>.*
*Axial NECT demonstrates a large left frontal intraparenchymal hematoma <img src='img/arrows/BO.png'/> causing subfalcine herniation to the right <img src='img/arrows/CS.png'/>. The left lateral ventricle is effaced. The posterior right lateral ventricle is mildly dilated <img src='img/arrows/CO.png'/>.*
![Axial NECT shows a large amount of intraventricular hemorrhage <img src='/img/arrows/CS.png'/> resulting in moderate asymmetric expansion of the left lateral ventricle. A smaller amount of layering blood products is seen in the right lateral ventricle <img src='/img/arrows/CO.png'/>.](3e87fdc0-f72c-4519-8fa8-407d3ca749a8)
![Axial NECT shows a large amount of intraventricular hemorrhage <img src='img/arrows/CS.png'/> resulting in moderate asymmetric expansion of the left lateral ventricle. A smaller amount of layering blood products is seen in the right lateral ventricle <img src='img/arrows/CO.png'/>.](3e87fdc0-f72c-4519-8fa8-407d3ca749a8)
**Intraventricular Hemorrhage**
*Axial NECT shows a large amount of intraventricular hemorrhage <img src='/img/arrows/CS.png'/> resulting in moderate asymmetric expansion of the left lateral ventricle. A smaller amount of layering blood products is seen in the right lateral ventricle <img src='/img/arrows/CO.png'/>.*
*Axial NECT shows a large amount of intraventricular hemorrhage <img src='img/arrows/CS.png'/> resulting in moderate asymmetric expansion of the left lateral ventricle. A smaller amount of layering blood products is seen in the right lateral ventricle <img src='img/arrows/CO.png'/>.*
![Axial T2WI MR shows mild, asymmetric, right hemispheric volume loss with prominent sulci <img src='/img/arrows/CS.png'/> and mild, asymmetric, right lateral ventricle dilatation <img src='/img/arrows/CO.png'/> in a pediatric patient with Rasmussen encephalitis.](de0627e1-81c9-498e-9a0e-9f525bf8351e)
![Axial T2WI MR shows mild, asymmetric, right hemispheric volume loss with prominent sulci <img src='img/arrows/CS.png'/> and mild, asymmetric, right lateral ventricle dilatation <img src='img/arrows/CO.png'/> in a pediatric patient with Rasmussen encephalitis.](de0627e1-81c9-498e-9a0e-9f525bf8351e)
**Rasmussen Encephalitis**
*Axial T2WI MR shows mild, asymmetric, right hemispheric volume loss with prominent sulci <img src='/img/arrows/CS.png'/> and mild, asymmetric, right lateral ventricle dilatation <img src='/img/arrows/CO.png'/> in a pediatric patient with Rasmussen encephalitis.*
*Axial T2WI MR shows mild, asymmetric, right hemispheric volume loss with prominent sulci <img src='img/arrows/CS.png'/> and mild, asymmetric, right lateral ventricle dilatation <img src='img/arrows/CO.png'/> in a pediatric patient with Rasmussen encephalitis.*
![Axial FLAIR MR shows a round mass in the right occipital lobe <img src='/img/arrows/CS.png'/> (primary CNS lymphoma) that effaces the adjacent right occipital horn and atrium <img src='/img/arrows/CO.png'/>. Extrinsic mass effect is a common cause of ventricular asymmetry and compression.](images/app.statdx.com_image_thumbnail_e0671196-28db-4361-9b63-cdc32902585b_annotated_true_size_900_quality_90_9b78cd11_20251018T165124Z.jpg)
![Axial FLAIR MR shows a round mass in the right occipital lobe <img src='img/arrows/CS.png'/> (primary CNS lymphoma) that effaces the adjacent right occipital horn and atrium <img src='img/arrows/CO.png'/>. Extrinsic mass effect is a common cause of ventricular asymmetry and compression.](images/app.statdx.com_image_thumbnail_e0671196-28db-4361-9b63-cdc32902585b_annotated_true_size_900_quality_90_9b78cd11_20251018T165124Z.jpg)
**Extrinsic Mass Effect**
*Axial FLAIR MR shows a round mass in the right occipital lobe <img src='/img/arrows/CS.png'/> (primary CNS lymphoma) that effaces the adjacent right occipital horn and atrium <img src='/img/arrows/CO.png'/>. Extrinsic mass effect is a common cause of ventricular asymmetry and compression.*
*Axial FLAIR MR shows a round mass in the right occipital lobe <img src='img/arrows/CS.png'/> (primary CNS lymphoma) that effaces the adjacent right occipital horn and atrium <img src='img/arrows/CO.png'/>. Extrinsic mass effect is a common cause of ventricular asymmetry and compression.*
![Axial T1WI C+ MR demonstrates a heterogeneous enhancing mass <img src='/img/arrows/CS.png'/> arising from the septum pellucidum, a pathologically proven central neurocytoma. Note moderate asymmetric dilatation of the right lateral ventricle <img src='/img/arrows/CO.png'/>.](ec4b2b8a-cd64-45e6-9430-1727c705ee35)
![Axial T1WI C+ MR demonstrates a heterogeneous enhancing mass <img src='img/arrows/CS.png'/> arising from the septum pellucidum, a pathologically proven central neurocytoma. Note moderate asymmetric dilatation of the right lateral ventricle <img src='img/arrows/CO.png'/>.](ec4b2b8a-cd64-45e6-9430-1727c705ee35)
**Neurocytoma, Central**
*Axial T1WI C+ MR demonstrates a heterogeneous enhancing mass <img src='/img/arrows/CS.png'/> arising from the septum pellucidum, a pathologically proven central neurocytoma. Note moderate asymmetric dilatation of the right lateral ventricle <img src='/img/arrows/CO.png'/>.*
*Axial T1WI C+ MR demonstrates a heterogeneous enhancing mass <img src='img/arrows/CS.png'/> arising from the septum pellucidum, a pathologically proven central neurocytoma. Note moderate asymmetric dilatation of the right lateral ventricle <img src='img/arrows/CO.png'/>.*
![Axial FLAIR MR shows a left thalamic expansile mass <img src='/img/arrows/CS.png'/>, a glioblastoma, which demonstrated heterogeneous enhancement (not shown). It protrudes into and obstructs the left ventricular atrium, which is asymmetrically dilated <img src='/img/arrows/CO.png'/>.](cfe69151-f87a-4abc-aa1a-01fa9586fa5f)
![Axial FLAIR MR shows a left thalamic expansile mass <img src='img/arrows/CS.png'/>, a glioblastoma, which demonstrated heterogeneous enhancement (not shown). It protrudes into and obstructs the left ventricular atrium, which is asymmetrically dilated <img src='img/arrows/CO.png'/>.](cfe69151-f87a-4abc-aa1a-01fa9586fa5f)
**Obstructive Hydrocephalus**
*Axial FLAIR MR shows a left thalamic expansile mass <img src='/img/arrows/CS.png'/>, a glioblastoma, which demonstrated heterogeneous enhancement (not shown). It protrudes into and obstructs the left ventricular atrium, which is asymmetrically dilated <img src='/img/arrows/CO.png'/>.*
*Axial FLAIR MR shows a left thalamic expansile mass <img src='img/arrows/CS.png'/>, a glioblastoma, which demonstrated heterogeneous enhancement (not shown). It protrudes into and obstructs the left ventricular atrium, which is asymmetrically dilated <img src='img/arrows/CO.png'/>.*
![Axial T2WI MR demonstrates generalized left hemispheric encephalomalacia <img src='/img/arrows/CS.png'/> following necrotizing encephalitis of unknown origin. There is resultant mild ex-vacuo dilatation of the left lateral ventricle <img src='/img/arrows/CO.png'/>.](images/app.statdx.com_image_thumbnail_1c54ab83-8081-45a8-960e-a7f50c31cce6_annotated_true_size_900_quality_90_6554d649_20251018T165130Z.jpg)
![Axial T2WI MR demonstrates generalized left hemispheric encephalomalacia <img src='img/arrows/CS.png'/> following necrotizing encephalitis of unknown origin. There is resultant mild ex-vacuo dilatation of the left lateral ventricle <img src='img/arrows/CO.png'/>.](images/app.statdx.com_image_thumbnail_1c54ab83-8081-45a8-960e-a7f50c31cce6_annotated_true_size_900_quality_90_6554d649_20251018T165130Z.jpg)
**Encephalomalacia, General**
*Axial T2WI MR demonstrates generalized left hemispheric encephalomalacia <img src='/img/arrows/CS.png'/> following necrotizing encephalitis of unknown origin. There is resultant mild ex-vacuo dilatation of the left lateral ventricle <img src='/img/arrows/CO.png'/>.*
*Axial T2WI MR demonstrates generalized left hemispheric encephalomalacia <img src='img/arrows/CS.png'/> following necrotizing encephalitis of unknown origin. There is resultant mild ex-vacuo dilatation of the left lateral ventricle <img src='img/arrows/CO.png'/>.*
![Axial T1WI C+ MR shows an avidly enhancing, lobulated mass arising from the right ventricular atrium <img src='/img/arrows/CS.png'/>, a meningioma. Note the mild asymmetric dilatation of the left lateral ventricle <img src='/img/arrows/CO.png'/>.](b426de7c-024c-4f25-ab33-1e7a567fe147)
![Axial T1WI C+ MR shows an avidly enhancing, lobulated mass arising from the right ventricular atrium <img src='img/arrows/CS.png'/>, a meningioma. Note the mild asymmetric dilatation of the left lateral ventricle <img src='img/arrows/CO.png'/>.](b426de7c-024c-4f25-ab33-1e7a567fe147)
**Meningioma**
*Axial T1WI C+ MR shows an avidly enhancing, lobulated mass arising from the right ventricular atrium <img src='/img/arrows/CS.png'/>, a meningioma. Note the mild asymmetric dilatation of the left lateral ventricle <img src='/img/arrows/CO.png'/>.*
*Axial T1WI C+ MR shows an avidly enhancing, lobulated mass arising from the right ventricular atrium <img src='img/arrows/CS.png'/>, a meningioma. Note the mild asymmetric dilatation of the left lateral ventricle <img src='img/arrows/CO.png'/>.*
![Axial T2WI MR shows lateral ventricles with the right <img src='/img/arrows/CS.png'/> being larger than the left, representing a normal variant. Note mild bowing of the septum pellucidum across the midline <img src='/img/arrows/CC.png'/>.](images/app.statdx.com_image_thumbnail_7a290571-170f-4a98-8381-da762b17ab09_annotated_true_size_900_quality_90_97b6ac24_20251018T165124Z.jpg)
![Axial T2WI MR shows lateral ventricles with the right <img src='img/arrows/CS.png'/> being larger than the left, representing a normal variant. Note mild bowing of the septum pellucidum across the midline <img src='img/arrows/CC.png'/>.](images/app.statdx.com_image_thumbnail_7a290571-170f-4a98-8381-da762b17ab09_annotated_true_size_900_quality_90_97b6ac24_20251018T165124Z.jpg)
**Normal Variant**
*Axial T2WI MR shows lateral ventricles with the right <img src='/img/arrows/CS.png'/> being larger than the left, representing a normal variant. Note mild bowing of the septum pellucidum across the midline <img src='/img/arrows/CC.png'/>.*
*Axial T2WI MR shows lateral ventricles with the right <img src='img/arrows/CS.png'/> being larger than the left, representing a normal variant. Note mild bowing of the septum pellucidum across the midline <img src='img/arrows/CC.png'/>.*